Thank you I will give you the brain thing and extra points. (image below) 5/13

I'm pretty sure it's C

Step-by-step explanation:

To be a function no two inputs can have the same output. An input can have two different outputs. So it would again be C

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.